# What are the 7 triangles?

## What are the 7 triangles?

To learn about and construct the seven types of triangles that exist in the world: equilateral, right isosceles, obtuse isosceles, acute isosceles, right scalene, obtuse scalene, and acute scalene.

### Who gave Heron’s formula?

Heron of Alexandria

**Who discovered area in math?**

In 499 Aryabhata, a great mathematician-astronomer from the classical age of Indian mathematics and Indian astronomy, expressed the area of a triangle as one-half the base times the height in the Aryabhatiya (section 2.6). A formula equivalent to Heron’s was discovered by the Chinese independently of the Greeks.

**What is s in geometry?**

Symbols Meaning of the symbols π Ratio of circumference to diameter of a circle. s Usually Length of a side. b length of a base. A Area. h height of a figure.

## What do you mean by Heron’s formula?

In geometry, Heron’s formula (sometimes called Hero’s formula), named after Hero of Alexandria, gives the area of a triangle when the length of all three sides are known.

### What is an area formula?

L is the length, W is the width and H is the height. A is the area of the base, h is the height….Perimeter, Area, and Volume.

Table 2. Area Formulas | ||
---|---|---|

Shape | Formula | Variables |

Triangle | A=√s(s−a)(s−b)(s−c)where s=a + b + c2 | a , b , and c are the side lengths and s is the semiperimeter |

**Do you find area?**

To find the area of a rectangle, multiply its height by its width. For a square you only need to find the length of one of the sides (as each side is the same length) and then multiply this by itself to find the area.

**How do you find area with 3 sides?**

The area of a triangle is defined as the total region that is enclosed by the three sides of any particular triangle. Basically, it is equal to half of the base times height, i.e. A = 1/2 × b × h. Hence, to find the area of a tri-sided polygon, we have to know the base (b) and height (h) of it.

## What is S in area of triangle?

There are several ways to compute the area of a triangle. Another is Heron’s formula which gives the area in terms of the three sides of the triangle, specifically, as the square root of the product s(s – a)(s – b)(s – c) where s is the semiperimeter of the triangle, that is, s = (a + b + c)/2.

### What is a formula of perimeter of triangle?

The perimeter of a triangle is the sum of all its three sides. We can work out the perimeter using the following formula: Perimeter of a triangle = sum of all three sides. If a, b and c are the sides of the triangle, then. Perimeter of triangle = a + b + c.

**How do you find the area when all sides are different?**

How to use irregular area calculator?

- Step 1: Measure all sides of the area in one unit (Feet, Meter, Inches or any other).
- Step 2: Enter length of horizontal sides into Length 1 and Length 2. And Width of the vertical sides into Width 1 and Width 2.
- Step 3: Press calculate button.
- Our Formula: Area = b × h.

**How do you find area with 4 sides?**

Use the following equation: Area = side × side or A = s. Example: If one side of a square has a length of 4 feet, (t = 4), then the area of this square is simply t2, or 4 x 4 = 16 square feet.

## What shape has 4 sides with different lengths?

Rectangle: Four internal right angles, opposite sides of equal length. Parallelogram: Opposite sides are parallel, opposite sides are equal in length, opposite angles are equal.

### What has 4 equal sides but no right angles?

A rhombus is defined as a parallelogram with four equal sides. Is a rhombus always a rectangle? No, because a rhombus does not have to have 4 right angles. Kites have two pairs of adjacent sides that are equal.

**What is a 10 sided shape?**

decagon

**What is a 9 sided shape called?**

nonagon

## What is a 10000 sided shape called?

Myriagon

### What do you call a 12 sided shape?

A dodecagon is a 12-sided polygon.

**What is 11 sided shape called?**

Hendecagon

**What is a 100 sided shape?**

Hectogon

## What is 13 sided shape called?

triskaidecagon

### What do you call an 18 sided shape?

An 18-sided polygon, sometimes also called an octakaidecagon.

**What do you call a 69 sided shape?**

Tejan Gupta answered this. Dear studebt, For such large number of sides we call them simply 69-gon and 96-gon.

**What is an 18 Gon?**

In geometry, an octadecagon (or octakaidecagon) or 18-gon is an eighteen-sided polygon.

## How many triangles are in a 18 Gon?

N | Triangles with 3 diagonal endpoints | Total Number of Triangles |
---|---|---|

16 | 560 | 37424 |

17 | 680 | 53516 |

18 | 816 | 73404 |

19 | 969 | 101745 |